Composite brake drum



F. w. SCHMIDT Re. 20,661

courosrrz: BRAKE DRUM Feb. 22, 1938.

Original Filed latch 26, 1932 III/II IIIIIIIII I'll Y Ill 7 INVENTOR. .F'ram ScAmI'a L.

ATTORNEY.

Reissued Feb. 22, 1938 UNITED STATES PATENT i orrica COMPOSITE BRAKE DRUM mm w. Schmidt, Jackson, Micli.,- sssignor to Motor Wheel Corporation, Lansing, Mich, a

corporation of Mic Original No. 2,014,865; dated September 17, 1 935, Serial No. 601,423, March 26. 1932. Application for reissue May 11, 1936, Serial No. 79,158

4 Claims. (01. 1ss 21s) This invention relates to a method of forming composite brake drums and more particularly to a novel method for securing a brake drum web to a brake ring. The principal object of the pres- 5 ent invention is to provide a method forsecuring abrake drum web to a brake ring in a manner whereby an unusually strong composite brake drum is formed. Another object of the invention is the provision of a method of forming a 0 composite brake drum wherein a brake ring and a brake drum web are secured together by means of rivet-like projections formed in one of these parts extending through openings formed in the other part. A further object of the invention is the provision of a method of securing a brake web to a brake ring which includes riveting and welding the parts together. Other objects more or less incidental and ancillary to the foregoing will appear in the following description and claims.

For a better understanding of the invention, reference may now be had to the accompanying drawing in which:

Fig. I is a front view in elevation of a brake drum web which may be used in practicing the invention.

Fig. II is a partial sectional view through a composite brake drum showing the position of the parts before being riveted together.

Pig. III is a view similar to Fig. II showing the parts after being riveted together;

Figs. IV and V illustrate modified methods of securing a brake drum web to a brake ring; and

Fig. VI is a sectional view taken on substantially the line VI-VI of igure I.

rivet-like or tongue-like projections l4 cut out of and bent away fromthe body thereof. The peripheral flange I I may be provided with a plu- 4 rality of centering and leakage projections it which serve a purpose to be described presently. A plurality of welding projections I! are formed in the body of the web ll intermediate the rivetlike projections l4.

60 The brake drum web II is secured to the brake ring extending 55 through complementary openings it formed in the inturned flange ii of the brake ring, whereby the brake ring is supported by the rivet-like projections. The internal circumference of the pe-- ripheral flange i5 is slightly greater than'the external circumference of the brake ring I! so that at least some of'the centering and leakage projections l6 contact the outer surface of the brake ring and prevent the peripheral flange from contacting with the brake ring at any other points.

The brake ring I! as shown consists of an outer sheet metal shell including the radial flange II having secured to the cylindrical innersurface thereof a relatively thick brake shoe engaging portion preferably formed oi cast metal. The 15 tongue-like projections II on the supporting web I l are located radially inwardly of the brake shoe engaging portion when the ring I! and web II are assembled as shown in the drawing.

After the brake ring and web have been as- 2 sembled as just described with the rivet-like projections l4 extending through the openings ll, the web is secured to'the flange I! of the I 2 by passing an electric current throug these parts at the points of contact between the welding 25 projection l1 and'the flange II, whereby to eflfect welds at these points.

During the welding process the projections ll contacting with the brake ring I! and the rivetlike projections ll contacting with the flange i8 30 serve to center the respective parts and to control the amount of leakage of electric current so that satisfactory welds are assured at the desired welding points.

After the web has been welded to the brake ring flange as just described the free extremity of the rivet-like projections ll extend through the openings II in the flange II as illustrated in Fig. II. Thesefree extremities "are then flattened by any suitable operation to form heads ll 40 whereby to provide additional means for securing the web to the brake ring. If desired, the

' welding operation may be omitted and the web, I

tiona themselves.

' riphery extending As shown in Fig. IV a plurality of circumferentially spaced apart rivet-like projections 2| maybe cut out of and bent away from the inturned flange "'0! the brake ring ii. The web II will then be provided with a plurality of ciroumierentially spaced apart openings If for the reception of the rivet-like projections 20, the

free extremities of which are flattened out to form heads 22 whereby to secure the brake ring to theweb. The inturned. flange II of the brake ring I! may also be welded at a plurality .of desiredpdints to the web as was described in connection with the composite brake drum illus:

trated in Figs. 1, II and III.

Another'method of securing the-brake drum web II to the brake ring I! isillustrated in Fig. V. In this modification a plurality of circumierentially spaced apart rivet-like projections 23 are cut out of and' bent partially away from the body of the web ,II and the inner periphery of the inhirned flange II of the brake ring I! is seated .upon the The brake web It by means of projection welding, as defree extremity of these projections. ring I! may then be secured to the scribed in connection with the composite brake drum illustrated in Figs. 1, II and III, or by means of welding the free extremity of the rivetlike projection 23 to the inner peripheral edge of the inturned flange ll. 7

While only certain of the preferred methods of practicing the invention are shown and described, it should be understood that the invention is not limited thereto but is coextensive with the scope of the appended claims.

I claim:

1. A brake drum comprising a brake ring having a flange at one edge thereof, a web for supporting the ring, said web having integral projections located radially inwardly of its pethrough and contacting the of the flange to secure the web thereto, said web also having a peripheral flange contacting the. ring radially outwardly of said integral projections.

2. A composite brake drum comprising a brake shoe engaging portion having a radially inwardly extending flange providing an annular face at one edge of said engaging portion, said flange bdng provided with a plurality of circumferentially spaced rectangularly shaped apertures inopposite surfaces termediate its inner and outer peripheries, a brake drum web adapted to be attached to the wheel of a vehicleand having aradially extend-'- ing annular face contacting a portion ofthe aunular face of said flange in face to face relationship, said web having a plurality of axially .extending integral rectangular projections extending through said apertures, said projections being headed overagainst the face of said flange remote from said web. whereby the contacting surfaces of said contacting faces and the contacting surfaces of said projections and flange ,provide' a .low resistance heat conducting path from said brake shoe engaging portion and said brake drum web.

3. A composite brake drum comprising a sheet metal brake ring provided with a radially inwardly extending flange at one end thereof, a relatively thick brake shoe engaging ring secured to said sheet metal ring, said flange providing an annular portion, a brake drum web adapted to be secured to a vehicle wheel and having a dished portion and an annular. face closely contacting the annular face of said flange, said flange having a plurality of rectangular apertures circumferentially spaced apart and positioned intermediate said brake shoe engaging ring and the inner periphery of said flange, said web having a plurality of rectangular integral projections extending axially through said apertures, said projections being headed over so as to contact the face of said flange remote from said web tov secure the web to said flange, whereby the contacting surfaces of said web and said projections with said flange provide a low-resistance heat-conducting path to said web, for heat caused by brake applications and stored in said brake engaging ring. 1 I

4. A composite brake dl'llnl comprising a. brake ring having a radial flange at one edge thereof and providing an annular face, said flange being provided with a plurality of circumferentially spaced apertures, and a brake drum web having a peripheralportion providing an annular face fltting the annular face of said flange, said web having a plurality of integral flngers extending at an angle to said annular face of said web and through said apertures in said flange, said flngers being enlarged at their extremities to secure the annular faces of said web and flange together.

'r'nsmr w. scrmrn'r. 

